This lack of uniformity in the units and the denominations of the three systems of weights and measures is exemplified in the subjoined table. While the two weight systems have a unit in common, the grain, there is no correlation in the higher denominations, ounces and pounds. The desirability of adopting a fixed standard, applicable in all cases where great accuracy in weights and measures is requisite, has been frequently emphasized by writers on therapeutics. As we have premised, the present difficulty forms a cogent argument in favor of the metric system, as wisely adopted in the U. S. Pharmacopoeia. A remarkable disparity is shown in the liquid measures, in which there is no unit in common : a minim is not a grain, nor "a pint a pound the world around."